Improvement in vault-lights



. C. FRENCH.

Improvement in Vau Lights.

Patented Feb.13, 1872..

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N G l 2 3 6 8 8 PATENT OFFICE.

JAMES C. FRENCH, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN VAULT-LIGHTS.

Specification forming part of Letters Patent No. 123,688, dated February13, 1872.

SrECiErCATrCN.

I, JAMES C. FRENCH, of Chicago, inthe county of Cool; and State ofillinois, have invented a certain Improvement in Vault-Lights, forlighting basements, areas, vaults, 83e., ofwhich the following is aspecification:

Nature (md Objects of the Invention.

Description of the Accompanying Drawing. Figure l is a top orisoinetrical view of a plate embodying iny invention. Fi 2 is a seetionofthe saine through C C.

General Description.

E E are metallic plates, into Which the disks or lenses are set. G G G Gare rivets or studs that confine the plates together. F is a metallicring that holds the glass disks or lenses in position. B and D are glassdisks or lenses.

B, the upper lens, is made with ledges or projections on the bottom sideand outer edge that rests upon D, leaving an air space, A, between thelenses. D is constructed with projections upon its Lipper side and outeredge, corresponding with and ineeting proiections on B, and doubling thesize oi' the air space. This air space serves to equalize thetemperature of the disks or lenses With the air, and prevent thecondensation of moisture upon the bottom of the lenses.

By placing thin colored paper or other inaterial between the lenses ordisks B and D, When they are set in the plates the light can begraduated or colored, as may be desired.

Claim.

l claiin as my invention- 1. The combination oi' the lenses B and D withthe metallic plates E E, substantially as and for the purposehereinbeiore set forth.

2. The combination of the lenses B and D, substantialbr as described,and for the purpose hereinbefore set forth.

JAMES C. FRENCH.

Witnesses RICHARD R. FRENCH, FONTAINE MCCULLAM.

